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💰 Paid API

Vellum

vellum.totemworks.workers.dev · vellum.totemworks.workers.dev

Search ClinicalTrials.gov and return a short study list.

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Conformance
60/100
grade C · 3 of 9 criteria apply
Uptime
not graded
catalogue listing · no agent card to probe
Observed inflow · 30d
not yet measured
wallet declared · scan pending
Invocations · 7d
0
no calls observed
Listing drift · 7d
stable
2 snapshots tracked
Owner
unverified
claim this listing →

Dispute or improve this rating

C
Conformance score: 60/100
Catalogue listing, not an A2A agent: a paid API listed by cdp_discovery. Scored on the 3 criteria that apply (24 of 40 points, scaled to 100); the A2A card criteria do not apply.
Show breakdown Hide breakdown
partial Live endpoint 15/25
Our probe received an HTTP 402 payment challenge from the host: live, but paid.
partial Verified Identity 5/10
Provider declared: vellum.totemworks.workers.dev (https://vellum.totemworks.workers.dev/). Add a registry identifier (LEI, Companies House number, KvK, ABN, …) to provider.legalEntity for full verified-business credit.
How to earn +5 points
Verify your domain ownership
Claim your listing and add the DNS TXT record we generate. Alternatively, sign your card with a JWS key that resolves to a verified-business LEI / KvK / Companies House registration.
Docs
pass Freshness + modern flags 4/5
seen in upstream source within 0d
n/a Agent card · Protocol version · JWS signature · Uptime track record · Skill declaration · Security declaration

Activity

last 24h · 0 invocations No personal data recorded

No activity in the last 7 days.

Listing history

2 snapshots drifted 1×
Snapshots
Agent card snapshots
Captured Hash Snapshot
2026-11-06 20:26:59 current 8896b34d78fa… view →
2026-11-06 05:25:53 e78c8afdc632… view →

Endpoints

Browse x402 resources on this host

Pricing x402 on Base USDC Verified live · 402 challenge
From $0.0150 per call
Endpoint Price Currency
https://vellum.totemworks.workers.dev/api/trials/search
Base · live 402
 0.015 USDC
https://vellum.totemworks.workers.dev/api/trials/feasibility
Base · live 402
 5.0 USDC
https://vellum.totemworks.workers.dev/api/trials/NCT05700877
Base · live 402
 0.025 USDC
Settlement wallet: 0x428f6223e269621ae6b0b3ad8e1e608c2e494c95 on Base · basescan ↗
Listed by facilitators PayAI · 2
Observed on-chain inflow verified on-chain
Last 7d
$0.00
0 transfers · synced 2026-11-15
USDC on Base. Inflow to a wallet, not proof that every transfer was a paid call.
How it was settled and checked
$5.04 in the ledger, not classified yet.
Reproducible via eth_getLogs on USDC Transfer events to the wallet. How we classify
Payment authenticity How we measure this →
Single payer observed 2/5

Payer identities observed; a single payer accounts for effectively all observed volume.

The settlement wallet is shared with other indexed agents, so inflow cannot be attributed to this agent alone.

$5.04 assessed 4 transactions 4/7 days active · 30d window Payer identities available
A low label reflects what we can observe, not a finding about the operator.
How this was checked
3 evidence caveats · measured 2026-11-07.
Checks: daily volume aggregate, active day cadence, amount regularity, spike concentration, settlement wallet overlap, payer uniqueness, payer concentration, payer recurrence, payer payee overlap.
Sources: agent revenue daily, agents payment wallet, agent payment transactions.
Payer concentration and 7 / 30 / 90-day windows: wallet_intel, payment_intelligence · included in Pro
Agent cardhttps://vellum.totemworks.workers.dev/
Providerhttps://vellum.totemworks.workers.dev/
Docshttps://vellum.totemworks.workers.dev/api/trials/feasibility
Discovered via
cdp discovery

Health · last 1 probes

Probe log
When HTTP Live JSON-RPC Latency
2026-11-06 15:56:44 404 — —

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Audit evidence

JSON for vendor reviews. Signed copy verifies against our JWKS.

audit.json audit.json (JWS-signed) verification history
Raw agent card JSON 
{
  "_source": "cdp_discovery",
  "resource_count": 2,
  "sample": "https://vellum.totemworks.workers.dev/api/trials/search"
}